70
Frequency Ranges
In the 2.4-GHz frequency range the European regulation au-
thorities have designated 13 channels for WLAN. A channel
can have a bandwidth of 20 MHz (throughput up to
130 Mbit/s) or 40 MHz (throughput of up to 300 Mbit/s).
Channels located directly next to each other in the 2.4-GHz
band may overlap and result in mutual interference. For in-
stance, if several WLANs are operated close to each other in
the 2.4-GHz frequency range with a bandwidth of 20 MHz, a
distance of at least five channels should be left empty be-
tween each two channels used. This means that if channel 1
is selected for one WLAN, the channels 6 through 13 can be
selected for a second WLAN. This maintains the minimum dis-
tance between channels.
Should interference in a WLAN persist, the first step should
be to select a different channel.
WLAN Autochannel
With the WLAN autochannel function, the FRITZ!Box automati-
cally searches for the channel subject to the least interfer-
ence. This process takes into consideration interference from
radio networks in the vicinity (WLAN base stations) and po-
tential sources of interference (for instance video bridges, ba-
by monitors, microwave ovens). Should problems with inter-
ference persist despite this function, try to identify the source
of interference and switch it off manually.
Additional tips on interference in the WLAN radio network are
presented in the section
Ruling Out Interference Caused by
Other Wireless Networks from page 127
Allocation of the WLAN Channels in the 2.4-GHz Range
Channel
Frequency (GHz)
Channel
Frequency (GHz)
1
2.412
8
2.447
2
2.417
9
2.452
3
2.422
10
2.457
4
2.427
11
2.462
5
2.432
12
2.467
6
2.437
13
2.472
7
2.442
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